A Michigan teenager was frustrated by what he was learning in his sexual education class.

The teacher at East Lansing High School was focusing lessons on abstinence and the negative consequences of having sex, making it seem like a shameful act.

This boy’s mother was equally irritated when her son shared what he was learning and Alice Dreger asked to sit in on the next class.

Dreger, who is the author Galileo’s Middle Finger: Heretics, Activists, and the Search for Justice in Science, was shocked by what she observed and a series of tweets she wrote from the sidelines of the class have gone viral, sparking a conversation around sex-ed in school. Should kids be taught that sex is pleasurable and provided with information on contraception? Or should they be told to abstain all-together prior to marriage?

Dreger is a big believer in safe premarital sex and in a smart and humorous essay for The Stranger she shares that she’s learned three things from years of listening to sex expert Dan Savage’s radio show “Lovecast.”

(1) Sex is pleasurable, and there’s no good reason you should deny it to yourself if you have a consenting partner and you’re on the same page.

(2) Marrying someone who you haven’t had sex with is a potential disaster. How do you know if you’re sexually compatible?

(3) Whomever you love enough to marry deserves to have you well-practiced at sex before you marry.

This is far from what was being taught in Dreger’s son’s class. Abstinence was the focus and the teacher brought in a guest speaker who shared a harrowing tale of getting his girlfriend pregnant in high school even though she was on birth control. The message seemed to be that contraception doesn’t always work and you’re wise to avoid sex altogether.

The guest speaker went on to share that he later met the woman of his dream’s who refused to have sex until marriage. “You’ll find a good girl. If you find one who says ‘no,’ that’s the one you want,” he shared.

Next the teacher addressed contraception, focusing on the fact that condoms can fail.

In her essay filled with sarcasm and dry humor, Drager shares:

At this point, it became clear to me that while this was not technically abstinence-only sex education, it was terror-based sex education. By now, we had learned that sex is associated with drug abuse, drug overdose, disease, unwanted pregnancy—pretty much every horror you can name except shingles and Lawrence Welk.

And that good girls say “no,” and you don’t want you no slut who says “yes.”

Drager was enraged by what she was hearing and she started firing off tweets from the class.

Like this one…

I just want to grab all those kids after school and say HERE IS THE TRUTH. SEX FEELS GOOD. THAT'S WHY YOU SEEK IT. TAKE CARE & HAVE FUN.

Dreger sent out 45 tweets in total and media outlets across the country has picked up her story. East Lansing High School Principal Coby Fletcher has banned her from the high school. She can only drop off and pick up her son.

Fletcher told USA Today that the abstinence lesson is part of the district’s overall sex education and is presented by “an independent contractor working with Pregnancy Services of Greater Lansing, a group that counsels pregnant women to avoid abortion.”

“Liberal parents like me, the mistake we make is thinking of ourselves as the kind of people who don’t interfere in public schools,” she writes. “As a consequence, the only people who do interfere with sex-ed curricula are the conservatives. If people like me—people who want to see sex ed include teaching about masturbation, the pleasure urge, the existence of LGBT people—don’t show up and push our side, the “middle ground” turns out to be damned near the right.”